Join the sentences in two ways, with so and because.
Exemple: It started to rain. We went back home.
It started to rain so we went back home.
1.It went to bed late last night. I slept late this morning.
2.He couldn't find his pen. He wrote his homework in pencil.
3.There was nothing good on TV. They decided to rent a video.
4.The fans started to fight. The police came on the pitch.